Traffic on a major highway between Spain and France remained at a standstill despite attempts to clear a blockade by Catalan activists. Police arrested dozens, including a truck driver who tried to force his way through.
Police carried out an operation to break up a protest by Catalan pro-independence activists on Tuesday, but the highway blockade reformed just hours later.
French police arrested 18 protesters after using tear gas against the activists, reported the El Pais newspaper.
The Catalan police, the Mossos d'Esquadra, said they'd arrested a man for attempting to run over people when he tried to force through the blockade with his truck.
Hours after the police operation to clear protesters, the Catalan Traffic Service said that protesters were once again blocking the AP-7 highway.
Protesters decry 'unsolved political conflict' with Spain
The Democratic Tsunami, a Catalan civic group, claimed responsibility for the disruption. The group wrote on Twitter that both Catalonia and the Basque Country, another region with a separatist movement, "are living in an unsolved political conflict with the Spanish state."
The far-right Vox party saw its support surge in the election, jumping up to become the third-largest party in parliament, after running on a platform of taking a harsher stance against Catalan secessionists.